Register now to get rid of these ads!

Hot Rods what kind of Big Block Chev do I have?

Discussion in 'The Hokey Ass Message Board' started by wildwest, Aug 31, 2016.

  1. wildwest
    Joined: Jan 20, 2007
    Posts: 267

    wildwest
    Member

    I recently bought a project and I am having a heck of a time decoding the stamped number on the block

    The block casting number on the back of the engine drivers side is 3963512 which comes up as a 1969 427 or a 1970-75 454 but the stamped number on the front of the block passenger side is T07247BG and that doesn't seem to jive with anything I have found on any online decoders? especially the 7BG suffix code ? all the numbers are in plain sight and clear as day.

    any ideas?

    The engine is in a '28 Ford of all things and also has aluminum heads, casting number: 3946074 which came on high horse 427's like L88's
    and a factory GM aluminum manifold 3933163 which is from the same era.
    I don't know much about big block Chevs, and am just going by what I have found on line.
     
  2. big duece
    Joined: Jul 28, 2008
    Posts: 6,109

    big duece
    Member
    from kansas

    If its a 454, the flywheel and damper will have external balance lugs. 427 is internal balanced. Is there a block date code? If '70 or newer, possible 454. One site shows possible 69-71 as a 427, and 70-76 as a 454. Same casting #.
     
    Last edited: Aug 31, 2016
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    It's not an LS-7, that had the XCH suffix :)

    I don't know what you have, sounds like it's a pretty good motor though. It would be interesting to see what the casting date is on the back of the block, the heads, and the intake. The heads might have it underneath, mine do. kind of hard to see with them on the block. The casting date on the block should be near the casting number you already found, look for a letter follwed by two to four numbers such as G 22 75 or G 22 5

    Is there a second number/letter sequence stamped on the front of the block? if so it might be a partial VIN, if it was an engine that was removed from a vehicle. If it's a crate motor (over the counter) it won't have the partial VIN.
     
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    also maybe post a picture of the stamped number you found, some of them are not quite what they appear to be, they used some odd shaped number stamps.
     

  5. wineslob
    Joined: Mar 14, 2016
    Posts: 20

    wineslob

    Sounds like a boat anchor to me. Send it to me and I'll use for my boat, I swear. :D
     
    volvobrynk and LOU WELLS like this.
  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 17,899

    gimpyshotrods
    ALLIANCE MEMBER

    I have seen some stampings that must have been first block on Monday, or last block on Friday.

    Practically needed the Rosetta Stone on a few of them.

    Definitely post a picture. As close-up as you can and still be steady and focused.
     
    volvobrynk likes this.
  7. wheeldog57
    Joined: Dec 6, 2013
    Posts: 1,925

    wheeldog57
    Member

    I had one that was double stamped, same numbers overlapped, that was difficult to read. Sold to a guy who thought I stamped it like that

    Sent from my SM-G900V using The H.A.M.B. mobile app
     
  8. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,120

    theHIGHLANDER
    Member

    Well you're right, I can't find anything that makes sense either. The "BG" would indeed be where you'd find what it was used/built as and also in what model car/truck, yet it doesn't appear anywhere in online lists. I tried Canadian just for fun but get the same links. Running out of time, I didn't try to find tall deck stuff. Big block fans can tell just by looking if it's a tall deck, but I doubt that due to the casting #. Late 427 to early 454 seems logical but what flavor? Don't remove the idea that it could be from 1970, or in fact 46 years old (!) and could be anything now. Might even have a stroker kit in it and be a 496, might be a leftover service part with a different code than normal (Canada?), but the T in the TO confirms it as a "Tonnawanda" plant build and little else. I have some books I can check vs limited 'net knowledge but I'm in a scramble against the clock on multiple issues/builds at the moment.
     
  9. blowby
    Joined: Dec 27, 2012
    Posts: 7,197

    blowby
    Member
    from Nicasio Ca

    As I recall back from my days with them, the 4 bolt main blocks had oil cooler in and out bosses with plugs right above the oil filter. 2 bolts did not. I have a '73 454 2 bolt block and it does not, my '60s 427 4 bolt block did.
     
    Moriarity likes this.
  10. afaulk
    Joined: Jul 20, 2011
    Posts: 1,191

    afaulk
    Member

    If you cant find your suffix stamping in the published lists, you have an over the counter engine, most likely a warranty replacement but it could have been bought "over the counter" by a hot rodder. I have 2 of them, 302's that according to the published lists were never made.
     
  11. 34toddster
    Joined: Mar 28, 2006
    Posts: 1,481

    34toddster
    Member
    from Missouri

    All of the early 454 BBC blocks I've seen have 3 letter suffix codes like CRT etc, exception would be a crate motor I suppose, if the casting date isn't on the back look on the pass side by the pan rail for it
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    Most 454s I see are truck motors, the 70s versions usually have a 3 letter suffix starting with T.
     
  13. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    It's a 427 with square port aluminum heads:cool:...does anything else really matter after that?
     
    cavman and 34toddster like this.
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    Not really....
     
    Moriarity and falcongeorge like this.
  15. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,666

    Black Panther
    Member
    from SoCal

    Its probably a marine specific code...I've had a few of those over the years...found a post online where a guy wanted to know what 427 with "2CW" code meant...it was a reverse rotating 427 390 horse engine intended to be used in pairs....so pretty sure 7BG is a marine code...
     
  16. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    Last edited: Sep 1, 2016
  17. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,666

    Black Panther
    Member
    from SoCal

    Jim....it doesnt show up on the lists we see because it is not a car or truck specific code. All the lists we see are Camaro..Chevelle...Impala....Truck...etc. Over the years I've tried to find lists of marine codes without luck. That 2CW code I referenced was only sold through a certain outfit...maybe GM was making engines to spec for marine use.
     
  18. Katuna
    Joined: Feb 25, 2005
    Posts: 1,812

    Katuna
    Member
    from Clovis,Ca.

    Wouldn't that be a big surprise to drop it in, get it running and put it in gear... And go the wrong direction!


    Sent from my iPhone using The H.A.M.B. mobile app
     
  19. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    uh...did you actually look at the list I linked to? It's a marine engine code list! just what you are looking for.
     
  20. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,666

    Black Panther
    Member
    from SoCal

    Jim...lol...I did now. That's a great list....THANKS! The wording in the link implies it's the same ole same ole list. Never found a marine list online...but never really tried super hard. Last marine LS6 I had was several years ago...pre smart phones...
     
  21. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    It was really difficult to find that list....go to google...type in chevy marine suffix code
     
    volvobrynk likes this.
  22. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,120

    theHIGHLANDER
    Member

    If it's not in the Marine list try the Army.







    ;) Sorry, couldn't help myself ya know?
     
    volvobrynk, falcongeorge and squirrel like this.
  23. [​IMG]

    Maybe these guys will know??? :D
     
    falcongeorge likes this.
  24. ididntdoit1960
    Joined: Dec 13, 2011
    Posts: 1,009

    ididntdoit1960
    Member
    from Western MA

    What kind of big block chevy do you have?...........a bad ass one
     
  25. wildwest
    Joined: Jan 20, 2007
    Posts: 267

    wildwest
    Member

    Thanks for all the help guys ! I can't get pics to post (I'm pretty compu-retarded) The engine is still all together and in the car so pictures of the block casting numbers are pretty much impossible, the only way I got the numbers off of it was with a mirror and flashlight. The Heads and intake are probably from different engines, who knows? it has an aftermarket balancer and a aftermarket front distributor conversion. The Car was built in the late 1990's and I don't know much about it. The Aluminum heads have been fully polished on the outside ! The stamped number on the block is not double stamped and the number is clear as a bell and easy to read. The Roadster is a pretty standard 80's-90's build 16" wide goodyears on Centerlines on a chromed-out Vette rear, full fendered with a rumble seat and bumbers ! at least the front is still a dropped beam (with 4-bar of coarse)
     
  26. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,120

    theHIGHLANDER
    Member

    Damn, I guess I hate u just a little more with that description. Sounds like someone went all the way with it. I like BBCs as much as I like Packards.
     
  27. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,120

    theHIGHLANDER
    Member

    Some pics for the OP. Car has that 'charm' of the 80s IMO but what a great start
    IMG_2173.JPG IMG_2174.JPG IMG_2080.JPG IMG_2172.JPG
     
  28. indyjps
    Joined: Feb 21, 2007
    Posts: 4,037

    indyjps
    Member

    Pull the fender, change wheels and tires, maybe hood sides and call it done. In case you were looking for opinions??

    I've got a 454 marine, I'll post the numbers and pic in a week when I'm at that shop. Very cool block, has 4 bolt mains on the front and rear, not just the middle caps. I'll do a 496 with it eventually.
     
  29. squirrel
    Joined: Sep 23, 2004
    Posts: 47,472

    squirrel
    Member

    like every other BBC with 4 bolt mains....only the small blocks have 2 bolts at the front and back mains. The small block was designed as a 2 bolt main motor, the big block was designed as a 4 bolt main motor.

    My guess is, the car could move pretty good with that mill.
     
  30. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Uh yea, 8.20-16 bias plys are JUST what that car needs...:rolleyes:
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.